/Engine/Source/Runtime/Core/Public/Misc/MapErrors.h
{Actor} : Large actor casts a shadow and will cause an extreme performance hit unless bUseBooleanEnvironmentShadowing is set to true: A large actor has been set to cast shadows - this will cause extreme performance issues and should have bUseBooleanEnvironmentShadowing set to true.
static [FLazyName](API\Runtime\Core\UObject\FLazyName) ActorLargeShadowCaster;